Diamond cut headlights and corners. Retrofitted Morimoto projectors with HID lighting. This is the best overall option, IMHO. I reviewed my setup in the EF reviews section. Other threads in the archives too.
My '99 has the same heads as your '97. I've used premium halogens (Silverstars), three different HID setups without projectors (including two so called Bi-Xenon setups) and those eBay one piece projectors.
Halogens do not touch HID for brightness. Straight HID throws lots of glare and have uneven, unfocused light (albeit bright). Expect LOTS of people to flash you if you don't take time to aim them. The one piece projector headlights have a much better beam and are bright, but I think they look ugly on our trucks and the wiring is cheap and the lights don't fit right, IMHO.
I have the Morimoto setup now. I'm currently in Wisconsin, having traveled 1,500 miles over two days, both days pushing off at 4 AM. I'm doing the return trip on Monday morning. While the setup usn't as refined as an OEM setup in a BMW or a Lexus, it is damn good and the lighting is fantastic.
I recommend that option. A bit more costly than other options and takes more work, but the results are worth it. As before, search the archives to learn more on the options I've listed above.
Click Dead Link Removed for my review.